JPH1023975A - Device for preventing short-water for fryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent a short-water by a heater and to let an operator recognize abnormality by outputting an abnormality alarm at the same time. SOLUTION: A relay X1 is serially connected to an always closed contact X3 -b, 1st contact TH1 -1 and short-water detector TH2 . Between the always closed contact X3 -b and the 1st contact TH1 -1, a relay X2 connected to a three- phase power source is connected parallelly with the relay X1 . A relay X3 is serially connected to a 2nd contact TH1 -2. A buzzer BZ is serially connected to an always opened contact X3 -a. A heater H is connected through always opened contacts X2 -a and X1 -a to the three-phase power source. When an oil temperature thermosensitive cylinder detects the set temperature, the 1st contact TH1 -1 of a temperature regulator TH1 is opened. When the oil temperature thrmosensitive cylinder detects the lower limit temperature lower than the set temperature or the upper limit temperature higher than the set temperature, the 2nd contact TH1 -2 of the temperature regulator TH1 is closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fryer for preventing cooking of fish or vegetables by heating cooking oil.

[0002]

2. Description of the Related Art As shown in FIGS. 8 and 9, a flyer used in a coffee shop, a restaurant or other eating and drinking facilities is pivotable to a main body (not shown) above an oil tank 10 in which a required amount of cooking oil is stored. The electrical box 12 provided is facing. The electric box 12 is provided with an L-shaped heater H for oil heating via a vertical portion 14a. The horizontal portion 14b is always provided near the bottom of the oil tank 10 as shown in FIG. The heater H is arranged so as to be substantially horizontal, and the heater H can be swung up together with the electric box 12 as needed for cleaning or other purposes. In the fryer configured as described above, the cooking oil stored at a predetermined level in the oil tank 10 is heated to a predetermined temperature by the heater H, and various cooking products are put into the cooking oil and cooked. Has become.

[0003] The inside of the oil tank 10, is the oil temperature thermo temperature sensing tube 16 connected to temperature controller TH ₁ is arranged to be disposed in the control circuit shown in FIG. 10, an edible oil according to the temperature sensitive cylinder 16 Is controlled so as to maintain the temperature of the edible oil at a preset temperature by controlling the energization of the heater H in accordance with the detected temperature. Further, air-cook prevent thermo temperature sensing tube 18 connected to the heater air cook detector TH ₂ disposed in the control circuit being disposed to contact the horizontal portion 14b of the heater H, edible oil is empty When the empty cooking prevention thermo-sensitive cylinder 18 detects that the heater H has been heated to an abnormally high temperature in the state described above or in a small amount, the power supply to the heater H is stopped to prevent the empty cooking. It is configured as follows.

[0004] The control circuit of the fryer, as shown in FIG. 10, the power switch SW is connected to a three-phase power supply, power light L _1, the contact TH ₁ -1 of the temperature controller TH ₁ and a temperature controller TH ₁ heater air cook detector TH ₂ in series connected relay X are connected in parallel relationship. Also between the heater air cook detector TH ₂ and the relay X, heater energizing lamp L ₂ to be connected to three-phase power supply is connected in parallel relationship with the relay X. Furthermore, a heater H is connected to the three-phase power supply via a normally open contact Xa of the relay X, respectively. Incidentally, the contacts TH ₁ -1 of the temperature controller TH ₁ is closed when said oil temperature thermo temperature sensing tube 16 is detecting a temperature lower than the set temperature set in advance, the temperature sensitive cylinder 16 set temperature It is set to open when it detects. The heater air cook detector TH _2, the closed when the air-cook prevent thermo temperature sensing tube 18 is detecting a lower temperature than the preset abnormally high temperature, when the temperature sensitive cylinder 18 detects the abnormally high temperature Is set to open to

That is, when the power switch SW is turned on (ON) when using the flyer, the power lamp L
With ₁ is lit, it is energized to a temperature controller TH _1. At this time, the oil temperature thermo temperature sensing tube 16 and the air-cook prevent thermo temperature sensing tube 18 is to detect the temperature lower than the set temperature, or abnormally high, temperature controller TH contacts TH ₁ -1 and the heater empty cook detection of ₁ both vessels TH ₂ is closed. Therefore,
Relay X is energized via the contacts TH ₁ -1 and the heater air cook detector TH _2, the normally open contact X-a is made is energized by closing the respective heater H in the oil vessel 10 that cooperates with this Cooking oil is heated. Incidentally, the heater energizing lamp L ₂ is also lit, indicating that the heating of the edible oil has been made by the heater H.

[0006] The oil temperature thermo temperature sensing tube 16 that the temperature of the cooking oil reaches the preset temperature, which is heated by the heater H is detected, the temperature controller TH ₁ contacts TH ₁ -1 are open relay X is deactivated and the normally open contact X-
a is opened and the power supply to the heater H is stopped. Further, when the heating by the heater H is stopped and the oil temperature thermosensitive cylinder 16 detects that the temperature of the edible oil has dropped below the set temperature,
Contact TH ₁ -1 of the temperature controller TH ₁ is closed, resume heating by the heater H. Thereby, the temperature of the edible oil in the oil tank 10 is maintained at the set temperature.

When the cooking oil is drained from the oil tank 10 or the oil level of the cooking oil decreases below the horizontal portion 14b of the heater H while the flyer is performing the above-described operation, the heater H is heated and becomes abnormal. High temperature. When the this air-cook prevent thermo temperature sensing tube 18 detects, stops power supply to the heater H to open the heater air cook detector TH _2, empty the heater H cook is prevented.

[0008]

In the above-mentioned flyer, the fried scum separated from the article to be cooked and the batter adheres to the surface of the heater H with time, and the temperature is accurately detected by the thermo-sensing cylinder 18 for preventing empty cooking. There was a drawback that malfunctioning occurred. That is, even though the heater H is being cooked in an empty state, the thermo-cylinder 18 for preventing the cooking from being in an empty state does not detect an abnormally high temperature, so that the product life of the heater H is shortened. There is a problem in that the thermally decomposed edible oil adheres to the heat sink, lowering the thermal conductivity and increasing power consumption.
If the normally open contact Xa of the relay X for controlling the energization of the heater H is not opened due to welding due to some external factor or life, etc., the temperature of the edible oil becomes higher than the set temperature and good cooking is performed. It is pointed out that it is not possible to do this.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems inherent in the prior art, and has been proposed in order to preferably solve the problem. It is an object of the present invention to provide an apparatus for preventing an empty cooker of a flyer, which can output an abnormality alarm to alert an operator of the abnormality.

[0010]

[Means for solving the problems] To overcome the above-mentioned problems,
In order to suitably achieve the intended purpose, the present invention is connected to a heater for heating edible oil stored in an oil tank and a temperature-sensitive cylinder for detecting the temperature of the edible oil, and according to the detected temperature of the temperature-sensitive cylinder. Temperature control means for controlling the power supply to the heater to maintain the edible oil at a preset temperature by controlling the energization of the heater, after the temperature sensing tube detects the set temperature, the lower limit temperature lower than the set temperature Alternatively, there is provided a protection means for stopping power supply to the heater when the temperature-sensitive cylinder detects a high upper limit temperature.

[0011]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an apparatus for preventing fryers from being cooked according to the present invention. FIG. 1 shows an electric control circuit of an apparatus for preventing an empty cooking of a fryer according to an embodiment, and FIG. 2 is a schematic perspective view showing an arrangement structure of an oil temperature thermo-sensitive cylinder. The flyer according to the embodiment basically has the configuration described with reference to FIGS. 8 and 9.

As shown in FIG. 2, a heater H mounted on an electric box 12 rotatably disposed above the oil tank 10 is provided with four L-shaped heater bodies 14 in a width direction. An oil temperature thermo-sensitive cylinder 16 is provided between the two heaters 14 and 14 which are formed at a distance from each other and are located in the middle.
A first mounting plate 20 and two second mounting plates 2 having the shapes shown in FIG.
It is adapted to be mounted via 2,22. First
The mounting plate 20 is made of a metal plate having a high thermal conductivity, and is formed by bending a vertical plate 26 vertically at an inclined upper edge of a rectangular inclined plate 24 and a horizontal plate at an inclined lower edge. It is basically composed of a horizontal plate 28. The vertical plate 26
The first holding piece 2 extending toward the back side is provided at both ends in the width direction of
6a and 26a are bent and second ends extending toward the rear side (downward in FIG. 3) are provided at both ends in the width direction of the horizontal plate 28.
The holding pieces 28a, 28a are bent. The spacing between the first holding pieces 26a, 26a and the second holding pieces 28a, 28a is determined by the distance between the two heaters 14,
14 is set to be substantially the same as the separation distance of the outer end of the heater H.
When the vertical plate 26 and the horizontal plate 28 are brought into contact with each other from the front side, as shown in FIGS. 4 and 5, the two heater bodies 14, 14 are held by the first holding pieces 26a, 26a and the second holding members. The pieces 28a are configured to be sandwiched from outside by the pieces 28a. In the vertical plate 26 and the horizontal plate 28, a plurality of (two in this embodiment) through holes 26b, 2 are spaced apart in the width direction.
8b is drilled.

Each of the second mounting plates 22 has a rectangular flat plate portion 22a and inclined portions 22 formed at both ends in the width direction of the flat plate portion 22a and inclined in a direction away from the first mounting plate 20.
b, 22b. The flat plate portion 22a has
A through hole 26b formed in the vertical plate 26 of the first mounting plate 20,
26b or through holes 28b, 28b formed in the horizontal plate 28
A screw hole 22c is formed at a position corresponding to. The inclined portions 22b, 22b of the second mounting plate 22 are provided between the two heater bodies 14, 14 of the heater H.
It is set so as to contact the heaters 14 with the 2a facing. Then, the vertical plate 26 and the horizontal plate 28 of the first mounting plate 20 are brought into contact with the vertical portion 14a and the horizontal portion 14b of the heater H from the front side, and the second mounting plates 22, 22 are connected to the vertical plate 26 and the horizontal plate 28. The screws 30, 30 inserted into the through holes 26b, 28b formed in the vertical plate 26 and the horizontal plate 28 while being in contact with the back side of the corresponding heater H are inserted into the screw holes 2 of the corresponding second mounting plate 22.
By screwing the mounting plate 2c, the mounting plates 20, 22 are mounted with the heater H held therebetween.

As shown in FIG. 4, the second mounting plate 22 corresponding to the vertical plate 26 of the first mounting plate 20 has the inclined portions 22b, 22b in contact with the heaters 14, 14, respectively.
A predetermined gap S is set between the flat plate portion 22a and the vertical plate 26, and the oil temperature thermo-sensitive cylinder 16 faces the gap S. The first mounting plate 20 and the second mounting plate 22 also have a function of protecting the oil temperature thermo-sensitive cylinder 16.

The oil temperature thermo-sensitive cylinder 16 is connected to a temperature controller TH ₁ as temperature control means provided in the electric control circuit shown in FIG. This temperature controller TH ₁
Second contact TH ₁ as a first contact point TH ₁ -1 and protection means -
And a 2, the first contact TH ₁ -1, the detection of the closure, and the temperature sensitive cylinder 16 is set temperature when the oil temperature thermo temperature sensing tube 16 is detecting a temperature lower than the set temperature set in advance It is set to open when it is released. That is, the first contact TH ₁ -1 is subjected to a current control of the heater H according to the temperature detected by the oil temperature thermo temperature sensing tube 16, functions to maintain the temperature of the cooking oil to the set temperature. The second contact point TH _1-2 is
It is always opened and closed when the oil temperature thermo-sensitive cylinder 16 detects a lower limit temperature lower than the set temperature or an upper limit temperature higher than the set temperature, and functions to detect an abnormal situation such as empty cooking. The oil temperature thermo-sensitive cylinder 16 detects the lower limit temperature before the edible oil is heated from the low temperature to the set temperature (see FIG. 6), but at this time, the second contact point TH _1-2.
Is set not to close. That is, in the subsequent the edible oil has once reached the set temperature, is controlled so as to close the second contact TH ₁ -2 when the oil temperature thermo temperature sensing tube 16 detects the lower limit temperature or the upper limit temperature.

[0016] The heater air cook detector TH ₂ to connect to the air-cook prevent thermo temperature sensing tube 18 disposed so as to contact the horizontal portion 14b of the heater H is, as described above, air-cook prevent thermo temperature sensing tube The thermosensitive cylinder 18 is set to be closed when it detects a temperature lower than a preset abnormal high temperature, and is opened when the thermosensitive cylinder 18 detects an abnormal high temperature.

FIG. 1 shows an example of an electric control circuit of a flyer according to the embodiment. In the figure, the power switch SW is connected to a three-phase power supply, power light L _1, temperature controller TH _1, the normally closed contact of the relay X ₃ X ₃ -b and temperature controller first contact of TH ₁ TH ₁ -1 And a relay X ₁ connected in series to the heater empty detector TH ₂ , and a second contact TH _1-2 of the temperature controller TH ₁ .
Buzzer B as alarm means connected in series with normally open contacts X ₃ -a series connected relay X _3, and the relay X ₃ to
Z are connected in a parallel relationship. Also between the heater air cook detector TH ₂ and the relay X _1, heater energizing lamp L ₂ to be connected to three-phase power supply is connected in a relationship parallel to the relay X _1. Further, the normally closed contact of the relay X ₃ X ₃ -b and temperature controller T
Between the first contact point TH ₁ -1 of H _1, relay X ₂ to be connected to three-phase power supply is connected in a relationship parallel to the relay X _1. Incidentally, the normally open contact X ₃ -a of the relay X ₃ are connected in parallel relationship with the relay X _3, and the relay X ₃ and the self-holding can be configured.

[0018] three-phase power supply, the heater H through the normally open contact X ₂ -a and the normally open contact X ₁ -a relay X ₁ each relay X ₂ are connected. While the normally open contact X ₁ -a of the relay X ₁ is closed, the normally open contact X of the relay X ₂ is closed.
_{When 2-} a is opened, the power supply to the heater H is stopped.

[0019]

Next, the operation of the apparatus for preventing fryers from being cooked according to the embodiment will be described below with reference to the electric control circuit shown in FIG. Incidentally, edible oils is a temperature lower than the set temperature, the first contact TH ₁ -1 of the temperature controller TH ₁ is then second contact TH ₁ -2 is opened with being closed and the heater air cook detector TH ₂ is assumed to be closed.

(About normal operation) The power switch SW
When turning on the power light L ₁ is energized to a temperature controller TH ₁ with lights. Normally closed contact X ₃ of relay X ₃
-B, relay X ₁ and the first contact TH ₁ -1 and the heater air temperature controller TH ₁ cook through the detector TH ₂ is excited energized, normally open contacts X ₁ -a is closed for cooperation with this I do. The relay X ₂ is energized energized through the normally closed contact X ₃ -b for the relay X _3, by the normally open contact X ₂ -a is closed cooperating therewith, it is made energization to the heater H The cooking oil is heated.

When the oil temperature thermosensitive cylinder 16 detects that the temperature of the edible oil stored in the oil tank 10 has exceeded the lower limit temperature and has reached the set temperature as shown in FIG. 6, the temperature controller TH _1. first contact TH ₁ -1 is opened, by the relay X ₁ is deenergized, the normally open contact X ₁ -a which cooperates with this
Is released, and the power supply to the heater H is stopped. Incidentally, the relay X ₂ at this time is not deenergized, the normally open contact X ₂ -a is held in the closed state. The stops heating by the heater H, the oil temperature thermo temperature sensing tube 16 does not detect the set temperature, the first contact TH ₁ -1 of the temperature controller TH ₁ is closed, resumes heating by the heater H I do. Thereby, the temperature of the edible oil in the oil tank 10 is maintained at the set temperature. Here, when the edible oil is heated from a low temperature to a set temperature is the oil temperature thermo temperature sensing tube 16 detects the lower limit temperature, the second contact TH ₁ -2 of the temperature controller TH ₁ in this case is closed Does not work. In addition, the lower limit temperature is set to a value lower than the temperature of the edible oil that decreases between the time when the heating by the heater H is stopped and the time when the heating by the heater H is performed again (see FIG. 6), and during normal operation. second contact TH ₁ -2 is prevented from closing. The first mounting plate 20 and the second mounting plate 2
The oil temperature thermo-sensitive cylinder 16 mounted in a sandwiched state between the oil temperature thermo-sensitive cylinder 16 and the oil temperature thermo-sensitive cylinder 16 has a vertical posture with respect to the oil surface, so that frying scum does not easily adhere around the cylinder, and an error in the detected temperature is prevented. Is suppressed.

When the cooking oil is drained from the oil tank 10 or when the cooking oil decreases and the oil level drops below the position where the oil temperature thermosensitive cylinder 16 is disposed, the oil is The thermo-thermosensitive tube 16 detects the outside air temperature. Therefore, as shown in FIG. 6, the temperature detected by the oil temperature thermo-sensitive cylinder 16 is lower than the lower limit temperature while the heating by the heater H is continued. In this case, when the oil temperature thermo-sensitive cylinder 16 detects the lower limit temperature, the second temperature of the temperature controller TH ₁
Contact TH ₁ -2 is closed. This relay X ₃ is energized energized by relay X ₁ and the relay X ₂ is deenergized the normally closed contact X ₃ -b which cooperates with this open,
The energization of the heater H is stopped to prevent empty cooking. That, or no longer the empty cook thermo temperature sensing tube 18 is normal temperature sensing, when the heater air cook detector TH ₂ has failed for some reason even, it is possible to reliably prevent the cooking empty heater H .

A normally open contact X ₃ -a cooperating with the relay X ₃
There by closing, with the relay X ₃ is self-holding, alarm (alarm output) is issued is energized to the buzzer BZ. Thus, the operator can know the occurrence of the empty cooking, and can promptly take measures to prevent the product life of the heater H from being shortened. The buzzer BZ is connected to the power switch S
The alarm continues to be issued until W is shut off (OFF).

(About the case where the contacts are welded) The heater H is energized by the first contact TH ₁ -1 of the temperature controller TH ₁ , and the temperature of the edible oil in the oil tank 10 is maintained at the set temperature. In this state, if the normally open contact X ₁ -a of the relay X ₁ that controls the energization of the heater H is welded due to some external factor, life, or the like, the first contact TH ₁
Power is supplied to the heater H regardless of the open / closed state of −1. Therefore, as shown in FIG. 7, the temperature of the edible oil rises above the upper limit temperature.
There when detecting the upper limit temperature, the second contact TH ₁ -2 of the temperature controller TH ₁ is closed. This relay X ₃ is excited energized by, by the relay X ₂ is deenergized the normally closed contact X ₃ -b which cooperates with this open, the normally open contact X ₂ -a which cooperates therewith open, the normally open contact X ₁ of the relay X ₁ -
Even if a is closed by welding, the power supply to the heater H is stopped, and abnormal heating of the edible oil is prevented. Also, at this time, the buzzer BZ issues an alarm, so that the operator can take prompt action.

Here, the first mounting plate 20 for mounting the oil temperature thermosensitive cylinder 16 to the heater H is in contact with the vertical portion 14a and the horizontal portion 14b of the heater body 14 over a wide area. The heat of the surface of the heater body 14 can be transmitted to the oil temperature thermo-sensitive cylinder 16 in a short time. That is, as described above, the normally open contact X ₁ -a
When the heater H is abnormally heated due to welding or the like, the heat on the surface of the heater H is transmitted to the oil temperature thermo-sensitive cylinder 16 through the first mounting plate 20 in a short time, and the abnormal heating of the heater H is quickly performed. Can be prevented.

The alarm means is not limited to a buzzer, but may be a lamp or the like, or a buzzer and a lamp may be used in combination.

[0027]

As described above, according to the apparatus for preventing empty cooking of a fryer according to the present invention, when the cooking oil is drained or the cooking oil is reduced during operation and the temperature sensing cylinder detects the lower limit temperature, By stopping the power supply to the heater by the protection means, the empty cooking can be reliably prevented. As a result, it is possible to prevent deterioration of the heater due to empty cooking, and to extend the product life of the heater. In addition, when the protection means is activated, an alarm can be issued by the alarm means to notify the worker of the abnormality, so that a prompt action can be taken.
Also, when the heater is continuously energized due to an abnormality of a mechanical part or the like for maintaining the cooking oil at the set temperature and the cooking oil becomes higher than the set temperature, this is detected and the protection unit is turned on. Can be stopped to prevent the cooking oil from being abnormally heated.

[Brief description of the drawings]

FIG. 1 is an electric control circuit diagram of an apparatus for preventing an empty cooking of a fryer according to an embodiment of the present invention.

FIG. 2 is a schematic perspective view showing an attachment structure of an oil temperature thermo-sensitive tube in the flyer according to the embodiment.

FIG. 3 is a perspective view showing first and second mounting plates of the oil temperature thermo-sensitive cylinder according to the embodiment.

FIG. 4 is a plan view traversing an attachment portion of the oil temperature thermo-sensitive cylinder according to the embodiment.

FIG. 5 is a side view showing a vertical section of a mounting portion of the oil temperature thermo-sensitive cylinder according to the embodiment.

FIG. 6 is a time chart when an empty cooker occurs in the fryer according to the embodiment.

FIG. 7 is a time chart when the contacts of the relay are welded in the flyer according to the embodiment.

FIG. 8 is a cross-sectional view illustrating a schematic configuration of a flyer according to a conventional technique.

FIG. 9 is a partially cutaway perspective view showing a schematic configuration of a flyer according to a conventional technique.

FIG. 10 is an electric control circuit diagram of a flyer according to the related art.

[Explanation of symbols]

10 oil tank, 16 oil temperature thermo-sensitive cylinder, H heater TH ₁ temperature controller (temperature control means), TH _1-2 second contact
(Protection means) BZ buzzer (Alarm means)

Claims (2)

[Claims] 1. A heater (H) for heating edible oil stored in an oil tank (10) and a temperature-sensitive cylinder (16) for detecting the temperature of the edible oil, and the temperature-sensitive cylinder (16) is detected. A temperature control means (TH ₁ ) for controlling energization to the heater (H) in accordance with the temperature to maintain the edible oil at a preset set temperature; Is detected, the lower limit temperature or the upper limit temperature lower than the set temperature is set to the temperature-sensitive cylinder (1).
When 6) detects an empty cook preventing device flyer, characterized in that it comprises a protection means for stopping the energization of said the heater _{(H) (TH 1 -2)} . 2. An apparatus according to claim 1, further comprising alarm means (BZ) for outputting an alarm when said protection means (TH ₁ -2) is activated.